Telephone substation apparatus



c. A. JOHNSON, JR., ET Al. 2,544,325

Marh 6, 1951 TELEPHONE SUBSTATION APPARATUS y4 Sheets-Sheet 1 Filed July 30, 1947 FIG?.

C .14.JOHNSON. JR. C L KRUMRE/CH /N VE N TORS Marh 5, 1951 c. A. JOHNSON, JR., ETAL 2,544,325

TELEPHONE SUBSTATION APPARATUS Filed July 50, 1947 4 Sheets-Sheet 2 W) fm c Af JOHNSON. JR. /N VEN Tof; C` L' KRUM/pE/CH AT TORNEV March 6, 1951 c. A. JOHNSON, JR., ETAL 2,544,325

TELEPHONE SUBSTATION APPARATUS 4 Sheets-Sheet 5 Filed July 30, 1947 VAR/S TOR INDUCTION COIL CONDENSER 6 FILTER BUSBR c.A.JoHNsoA/,JR. /NVEA/Tops CL. K/QUMpE/CH ATTORNEV March 6, 1951 c. A. JOHNSON, JR., ET AL 2,544,325

TELEPHONE SUBSTATIN* APPARATUS Filed Juy so, 1947 4 Sheets-Sheet 4 F/G. Z

w. u u w f CONDE NSER 5 FILTER cAJoHA/so/v JR. 0L. KRUMRE /N I/E N TOPS BVMW ATTORNEV Patented Mar. 6, 1951 UNITED STATES TELEPHONE sUes'rArroN APPARATUS Application `l'uly 30, 1947, Serial No. 764,614

1 Claim. 1

This invention relates to telephone substation apparatus and more particularly to mountings for hand telephones.

`One type of hand telephone mounting comprises a casing or housing having a portion or cradle for receiving a hand telephone, contact springs actuated in accordance lwith the placement of the hand telephone in or removal thereof from the cradle, and substation instrumentalities, such as a condenser, lter, induction coil and other circuit elements, mounted within the housing. These instrumentalities have been interconnected heretofore by a multiplicity of `wires connected to the instrumentalities and to terminal blocks, 'as by way of mechanical fasteners such as terminal screws.

In such constructions, the possibilities of open circuits or poor electrical connections are manifold. Also the establishment of proper interconnection of the components requires a large number of individual operations, as well as substantial skill on the part of the assembler, and, therefore, the manufacturenof telephone sets of these constructions is time consuming and relatively expensive. Additionally, in such sets including a dial, replacement of the dial in the event of failure thereof or removal of the dial to convert a set for use in manual systems involves a series of operations and entails substantial expense.

One object of this invention is to facilitate the manufacture of telephone substation apparatus.

Another object of this invention is to expedite and simplify the interconnection of the substation instrumentalities in telephone mountings.

A further object of this invention is to facilitate the mounting and replacement of the dial in telephone mountings.

Still another object of this invention is to improve the electrical interconnection of substation instrumentalities in telephone sets;

A still further object of this invention is to reduce the number of mechanical fasteners, such as screw type terminals, requisite forV the electrical association of the components of a telephone subset. A

In accordance with one feature of this invention, in a hand telephone mounting of the type heretofore described, certain of the substation in*- strumentalities are electrically interconnected by bus bars positioned in prescribed relation within the casing and housing, and terminals on the instrumentaliti'es the terminals and bus bars being provided with cooperating portions which are placed in immediate proximity for proper connec- (c1. 179-1oo 2 tion when the instrumentalities are positioned in the assembly of the set.

More speciiically, in accordance with one feature of Ithis invention, in a telephone set, there is vprovided an insulating mounting plate having therein a plurality of apertures extending from one face thereof to a recess in the other face, and having also therein grooves or channels in the one face thereof,` extending between the apertures in Yaccordance with a prescribed circuit design. Positioned in the grooves or channels are electrical conductors or bus bars havingend portions projecting through the apertures and into the recess aforenoted. The substation instrumentalities are provided with terminals, e. g. terminal prongs, adapted to extend through respective ones of the apertures and into the recess. Thus, when the instrumentalities and bus bars are positioned on the mounting plate, each terminal is in immediate proximity to an end portion of a bus bar. The terminals and respective bus bar ends may be xedly connected electrically, as by a mass soldering operation, whereby positive electrical connection of the substation circuit components is expedited and assured.

Adva'ntag'eously, the terminals and bus bar ends are located in a restricted yarea whereby the connection thereof may be effected readily and economically as by a dip or automatic soldering operation.

In accordance with another feature of this invention, a jack, appropriately connected electrically to the other substation circuit components and certain of the bus bars, is mounted upon the mounting plate and the dial is provided with extending terminals or prongs arranged to fit into the jack thereby to properly connect the dial in the substation circuit when the terminals are inserted into the jack. The dial also is supported from the mounting plate and, thus, may be replaced readily, as for repair or in the case of conversion of the telephone set for use in manual systems.

In accordance with a further feature of the invention, the contact springs constitute a part of a unitary assembly supported on the mounting plate and having terminals cooperatively associated with the proper bus bars, the assembly including also a spring operating member positioned to be operatively engaged by an actuating member, such as a plunger extending from the hand telephone receiving cradle in the housing of a desk or wall set.

The invention and the above-noted and other 3 features thereof will be understood more clearly and fully from the following detailed description with reference to the accompanying drawing, in which:

Fig. l is a side elevational view mainly in section of a telephone desk set illustrative of one embodiment of this invention;

Fig. 2 is a plan view of the desk set with the housing broken away and the dial removed;

Fig. 3 is a plan View of the terminal and mounting block included in the desk set;

Fig. 4 is a side view of the block;

Fig. 5 is a View in section taken along plane 5 5 of Fig. 3;

Fig. 6 is an exploded perspective View of the terminal and mounting block and the substation instrumentalities mounted thereby;

Eig. 7 is a partial bottom view of the desk set;

Fig. 8 is a detail View, partly in section, of the dial, the plug and jack therefor and the contact springs and associated operating mechanism included in the desk set; and

Fig.` 9 is a fragmentary View, mainly in section, illustrating the terminal connections for the condenser and filter assembly included in the desk set.

Referring now to the drawing, the telephone desk set therein illustrated comprises a housing of the general construction disclosed in Patent 2,996,946 granted October 19, 1937 to George R. Lum and John J. Kuhn and including a base I9, for example a metal plate, having supporting feet or pads II fastened thereon by screws I4, and a hollow casing I2. The casing has thereon two pairs of tines I3, only one pair of which is shown in Fig. l, defining portions of a cradle for receiving a hand telephone, not shown.

Aldxed to the base plate I0, as by screws |5 threaded thereinto, is an insulating block or plate I6, for example of hard rubber, having raised side portions II and I8 and having also recesses I9 and 29 in one face thereof and a recess 2! in the other face thereof. Both the side portions Il and i8 are provided with countersunk bores having tted therein metal eyelets 22, seen most clearly in Fig. 3, for receiving terminal screws to be described hereinafter. The block or plate IB is provided also with a plurality of groups or bores 23, 24, 25 and 2S and two groups of slots 27 and 28 which extend therethrough and communicate with the recess 2|. These bores and slots and also the bores having the eyelets 22 therein are interconnected, in the manner illustrated most clearly in Fig. 3, by channels or grooves 29 in one face of the block or plate I6. Seated in the grooves 29 are b-us bars each of which has an intermediate portion 39 fitted in the respective groove or channel, and end portions 3| which extend into the apertures or slots at the ends of the respective channel or groove and all of which, with the exception of those at the eyelets 22, project into the recess 2|.

As illustrated in Fig. 6, the bus bars may be formed of at stock provided with bent ends or may be stamped members the intermediate portions of which are seated edgewise in the grooves. Alternatively, the bus bars may be formed of round, square or other shaped wires.

Overlying the grooves and bus bars and aixed to the plate or block I5 is a cover plate 32 having an opening 33 therein opposite the slots 21 and 28 and having also groups of apertures 239,

240, 250 and 269, each aperture being aligned with a corresponding aperture in the block I6.

Supported upon the plate or block I6 are all of the instrumentalities requisite for the substation circuit. Specically, the instrumentalities include a condenser and lter unit 34 provided with terminal prongs 35 located to t into the apertures or bores 23 and 230, a varistor unit 36, such as a disc-type copper-oxide rectifier, having terminal prongs 31 arranged to pass into the apertures or bores 24 and 240, an equalizer 38 such as a ballast lamp and resistor having terminal prongs 39 arranged to enter the apertures or bores 25 and 25|] and a balancing network and induction coil unit 40 having terminal prongs 4| arranged to enter the apertures or bores 26 and 260, the unit 49 including a positioning stud 42 and the coil 43 thereof being seated in the recess 29. All of the terminal prongs are of suiicient length to project through the plate or block I6 and into the recess 2|.

Also mounted upon the cover plate 32 is a unitary jack and contact spring or switch assembly 44 which, as shown clearly in Fig. 8, comprises a two-part housing 45, 46, the part 45 having therein a jack 47 from which strip terminals 48 arranged to enter the slots 27 extend. The housing part 46 encloses a contact spring assembly 49 from which strip terminals 50 arranged to pass into the slots 28 extend.' One of the contact springs engages a pin or stud 5| extending slidably through an aperture in the housing part 46 and engaged by a finger 52 extending from a rocker member 53. The latter is mounted pivotally upon a bracket 54 affixed to the housing 45, 46 and, as shown most clearly in Figs. 2 and 8, comprises two arms each of which is engaged adjacent its free end by a respective reciprocable plunger 55 extending between the tines I3.

As shown clearly in Fig. 8, the terminals 48 and 50 are of suicient length to project into the recess 2|. L'

It will be noted that when the several substation instrumentalities aremounted upon the block I6 with the various terminals extending through the apertures or slots in this block, each terminal is adjacent and parallel to a respective end portion 3| of one of the bus bars. All of the terminals project into the recess 2|. Electrical connection between each terminal and the associated end portion 3| of a bus bar is established by soldering as illustrated at 56 in Fig. 9. All of the connections may be made simultaneously as by dipping the terminals and adjacent bus bar end portions into a mass of solder carried in a vessel of appropriate form to fit within the recess 2|. Thus, the several instrumentalities are firmly mounted in position and together with the plate or block I6 and cover plate 32 constitute a unitary assembly wherein the substation elements are electrically associated in a prescribed manner. The exact electrical interconnection of the parts may be varied, of course, by appropriate disposition of the grooves 29 and bus bars 39, 3| to fit any desired substation circuit.

Certain of the bus bars may -be provided, as illustrated in Figs. 2 and 7, with looped end portions 51 for receiving terminal screws 58 threaded into the eyelets 22. Multiconductor cords and cables 59 are connected to the terminals by way of the screws 58 and serve to associate a hand telephone with the substation circuit and conneet the 1atter to the telephoneline or usual junction box.

A ringer 66 is provided within the housing l0, l2, mounted upon the base I0 or block i6 and connected to proper cord terminals by Way of conductors, not shown.

Also provided is a dial 6I which is supported from the block i6 by a bracket 62 and has thereon strip terminals 63 arranged to t the jack 41 within the housing part 25.

Although a specic embodiment of the invention has been shown and described, it will be understood that it is but illustrative and that various modiiications may be made therein without departing from the scope and spirit of this invention as defined in the appended claim.

What is claimed is:

A telephone set comprising a housing having a base, a Wall, and having also a cradle portion for receiving a hand telephone, a, mounting plate seated upon said base and having therein a plurality of channels in one face thereof and a recess in the other face thereof, said wall having an aperture therein opposite said plate, said plate having also therein a plurality of apertures extending from said channels into said recess, substation circuit instrumentalities mounted on the one face ofsaid plate, terminals extending from each of said instrumentalities into preassigned ones of said apertures, a contact spring assembly mounted on said plate and including terminals extending into prescribed ones of said apertures, means for interconnecting said contact springs and instrumentalities to constitute a substation circuit, said means comprising bus bars in said channels and having portions extending into said apertures, each of said portions being connected to the respective terminal, an actuating member for the contact springs supported from said plate, reciprocable plunger means extending into said housing from said cradle and engaging said actuating member, a jack having terminals extending into certain of said apertures, bus bar means connecting said jack terminals to said circuit, a, dial supported from said plate and extending into said aperture in said Wall, and terminals extending from said dial and mating with said jack.

CHARLES A. JOHNSON, JR.

CHARLES L. KRUMREICH.

REFERENCES CITED The following references are of record in the le of this patent:

UNITED STATES PATENTS Number Name Date 2,066,876 Carpenter Jan. 5, 1937 2,226,734 McLarn Dec. 31, 1940 2,244,009 Hensch June 3, 1941 2,268,619 Reid Jan. 6, 1942 2,279,713 McLarn Apr. 14, 1942 2,333,299 Deakin Nov. 2, 1943 

